Improved trip motion for presses



elicited ltere @1a-'tent (attire,

ALBERT HAMLIN, or BROKLYN, New vdi-sit, A ssreNon'ro :MAYsa BLISS,

or SAME Peace.v

Letters Patent Nm 4:107,363, dated September 13, 1870; antedated September 5, 1870.

IMPROVED TRIP MOTION FOR PRESSES, &c.

The Schedule referred to in these Letters Patent and making part of the same To all whom may concern:

Be it known that I, ALBERT' HAMLIN, ot' Brooklyn, in the county of Kings and State of New York, have invented a. new and useful Improvement in Trip Motions for Presses, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing forming part of this specication, andin which- Figure l represents a iront-view of a power-press,

-having my improvement applied to it, and

Figure 2, a side view or section ot" the trip motion in part, taken as indicated by the line :c in iig. 1.

Similar letters of reference indicate correspomling parts.

My invention relates to trip motions for powerpresses, in which, without stopping the driving-shaft, or operating wheel, the plunger, in being arrest-ed by the trip motion, is. stopped at the top of its stroke, to facilitate access to the dies and operatingbed portion of the press; and

My improvement consists in a novel and advantageous combination of means for such purpose.-

In the accompanying drawing- A represents the bed of the press, in or on which is arranged the lower die.

B is the plunger, carrying the upper die, and arranged to slide vertically within or througha guidebox, C, connected with/the frame D ot" the press.

Said plunger is operated by an eccentric on an npper horizontal shaft, Ethrough a connecting-rod or link, a, or it may receive its` mot-ion from the drivingshaft E by any other means.V

F is the driving-pulley of the shaft E, which pulley is arranged to run ,loose on said shaft, and, when required to drive-,it is geared therewith through the intervention oi' a sliding clutch, G, made to fit a feather, b, on the shaft and gearing, when slid toward I the press with a clutch, G', fast to the loose drivingpulley F.

The pulley F also serves as a fly-wheel to the press, and being weighty, it is desirable, to prevent side heft and secure steadiness, to get it as close to the main frame as practicable; hence the clutches G G are arranged on the oii or outer side of said pulley, and

the trip motion, by its peculiar construction or arrangement of parts, favors such close disposition of the driving-'pulley to the main frame.

The trip motion is constructed as follows:

H is a treadle, arranged below the bed ot' the press, and serving, when depressed and held down by the foot, to bear down a vertically-sliding and suitablyguided rod, I, which causes a bell-crank lever, J, to slide and retain the clutch G in gear with the clutch G', said bell-crank lever J having its fulcrum, as atc,

on a bracket branching from the' 1'nain frame, and being keeps running.

Io secure Vthe press stopping only when the plunge-1' is raised, without reference to the period, in the stroke oi' said plunger, ot' releasing pressure from the treadle to arrest the press, the rod I is made to bear or project into close contact at its top against a cam, L,i`ast on the driving-shaft inside of the pulley, which cam is of a shape, for the greater portion of its periphery, to prevent the rod I from rising when pressure is refinoved from the treadle, and Vthe spring K bears it upward, but which cam has a reduction, as at d, on a portion of its periphery, so that, on said reduction' coming round, the rod I is shot by the spring K up to or against it, and the clutch G, of anecessity, ungeared from the pulley or clutch G', thereon, and the press thereby arrested in its mot-ion.

This reduction d is of a suitable sha-pe, to prevent any catching of the rod I, and to allow of its free rclease, and is so timed or arranged in relation to the plunger B as only to come round over the rod I when the plunger is at the top of its stroke, hence; no matter when the foot is released from the treadle to stop the press, suoli stoppage cannot take place before the plunger has made its 11p-stroke, which affords every facility for getting at the dies.

A weight may be substituted to act in the place ot' the spring K, and any suitable connecting device he used instead ot the bell-crank lever J.

What is here claimed, and desired to be secured by Letters Patent, is-

The combinationand'arrangement relatively, to the plunger' l5, ot' the cani L, formed witha reduction, d, on its periphery, the rod I, lever J and spring K, loose driving-pulley F, on the operating shatt E, and the clutches G G', substantially as specified.

Witnesses:

FRED. HAYNns, HENRY PALMER. 

